Roll for dewatering presses of paper making machines

ABSTRACT

A roll for dewatering presses of paper making machines consists of a roll body having a coating consisting of a strip or of rings The outer surface of the roll is provided with grooves. The invention is particularly characterized in that the strip has a longitudinal side elbow and that the rings have annular side ribs.

United States Patent 1 1 1111 3,718,959 Sailas 1 1 March 6, 1973 1 ROLL FOR DEWATERING PRESSES 0F 903,559 11/1908 PAPER MAKING MACHINES 1,128,706 2/1915 1,181,971 51916 [76] Inventor: Vamo Sarlas, Kansakoulu, 2,658,262 $1953 Vaajakoski, Finland 7 3 217 3 7 1 1 5 [22 Filed: Feb. 11, 1971 407,016 7/1889 21 1 App1.No.: 114,640

Primary Examiner-Alfred R. Guest Attorney-Richards & Geier [52] US. Cl ..29/121 H, 29/125 511 1111.01. ..B2lb 27/02 [571 ABSTRACT [58] Field of Search ..29/ 125, 121 H A roll f dewatering presses f paper making machines consists of a roll body having a coating con- [56] References Cited sisting of a strip or of rings The outer surface of the UNITED STATES PATENTS roll is providerl with grooves. The invention is articularly characterized in that the strip has a longitudinal 615,103 ll/l898 Peterson ..29/121 H UX side elbow and that the rings have annular side ribs. 769,680 9/1904 Bredannaz ..29/l25 X 798,072 8/1905 Quigley et a1 ..29/125 X 2 Claims, 4 Drawing Figures PATENTEU 61375 FIG. 4

INVENTOR V- 5 CL L [as 85 mgdaaJcktgilef In whatever manner a coat formed of a'strip may have been made, the coat has always been formed of a strip with broad sides, which in the coat lie against each other, of planar shape. Coating of the roll body with this strip has difficulties. This is because when the coat upon the roll body is formed by winding strip upon the roll body, against the roll body and also making the turns press tightly against each other are difficult to achieve. In fact, the adjacent turns of the strip have frequently been bonded together by welding or cementing. This is also necessary since in case of rupture of the strip the coat formed of such strip becomes unwound. If the coat of the, roll body has been formed of rings placed side by side upon the roll body and pressed against each other, the rings have always been such that their sides facing each other have been'planar. Exactly the same drawbacks as in the use of strip described above have also been encountered in the use of such rings.

An object of the-present invention is to eliminate these drawbacks which have taken place in the manufacture and use of rolls of the described type.

Other objects will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention it was found desirable to provide the strip with which the roll body is covered with a longitudinal side rib, while the rings carried by the roll body have an annular side rib.

Since the strip or the rings have a rib, it is not necessary to fix in the coat the adjacent turns, or adjacent rings, to each other. The coat cannot become unwound even if the turns should be ruptured. In addition, especially the rib on the strip has the effect that when a coat is being formed by winding the strip upon the roll body, the next turn will always tighten the preceding turn against the roll body. Thus it is only necessary to fix the coat to the roll body at its ends. The longitudinal rib on the strip may be either of such kind that the parts of the strip on both sides of the elbow are parallel and lie in the same plane or the parts of the strip on both sides of the rib may be parallel but displaced with reference to each other. On the rings, the ribs may either be shaped so that the parts of the ring on both sides of the rib are parallel and lie in the same plane or so that the parts of the ring on both sides of the rib are parallel but displaced with reference to each other. The coat upon the roll body may also be formed of two strips placed side by side and having a rib, one of the strips having greater width than the other. In that case the outer edge of the strip need not be profiled. The coat may also be formed of adjacent, alternating rings of two different diameters with elbows which register mutually.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawing showing by way of exthe tightening of the windings to lie firmly it ample only, preferred embodiments of the inventive idea.

In the Drawing:

FIG. 1 is a top view of a roll made in accordance with the present invention.

FIG. 2 is a section along the line Il--Il of FIG. 1.

FIG. 3 is an enlarged partial axial section through a roll of the present invention.

FIG. 4 is similar to FIG. 3 but shows a somewhat different construction.

The roll shown in the drawing consists of a roll body l upon which a coat has been formed of a profiled strip 2 in such manner that in this coat a helical groove 3 has been produced. The strip 2 may be made of a suitable, corrosion-resistant metal, but strip material of plastic or of some other substance may also be used. In the embodiment shown in FIG. 3 the strip, of which a coat has been formed upon the roll body I by winding this strip upon said roll body, has a rib 4 longitudinal to the strip. It has been made so that the part of the strip extending from the rib 4 towards the roll body I, i.e., the part 2a, is perpendicular to the mantle of the roll body 1 and lies in the same plane with and is parallel to the part 2c of the strip on the opposite side of the rib 4. The strip need only be fastened to the roll at its ends, and it is not necessary to fix adjacent turns of the strip to each other. Due to the rib on the strip, the coat will not become unwound even in the event of rupture of the strip. The strip 2 has been profiled so that there will be a ridge 2b on its outer edge. As a result, a groove 3, extending helically around the coat, is formed in the coat. By making the ridge 2b on the strip of desired height and thickness, a groove 3 of desired width and depth is produced.

The embodiment shown in FIG. 4 differs from that of FIG. 3 only in that the strip 2 has been provided with a rib of different type. Corresponding parts have been indicated by the same reference numerals. In this embodiment of FIG. 4 the rib 4 has such shape that the parts of strip on its both sides, 2a and 2c, are parallel but displaced with reference to each other. This strip is profiled in similar manner as that shown in FIG. 3. The same advantages are produced with this strip as with that in FIG. 3. This strip has the advantage that when a coat is formed by winding it upon the roll body 1, the next turn will always tighten the preceding turn against the roll body. The same advantage is also partly achieved in the embodiment illustrated in FIG. 3.

The invention is not limited to the described embodiments, but may be varied within the scope of the claims. For instance, the strip of which the coat is formed may have more than one rib. The coat may also be formed of two strips extendingside by side, and if the strips have different widths, then the strips need not be profiled. As already mentioned, the strips may be replaced with rings having an annular elbow.

I claim:

1. In a dewatering press of a paper making machine, a roll comprising a roll body, a coating covering said roll body and consisting of at least one assembly of helically wound strips, each of said strips having an inner portion engaging inner portions of adjacent strips and an outer portion narrower than the inner portion and spaced from outer portions of adjacent strips, whereby tions of the inner portion of each strip located between the rib extend in the same plane and wherein the width of said groove is substantially narrower than the depth of said groove formed by adjacent outer strip portions.

i i i i i UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION patent 3,718,959 Dated March 6, 1973 Inventor(s) VIANO SAILAS It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the cover sheet, insert [30] Foreign Priority Data Finland 410 70 Feb. 13, 1970 Signed and sealed this 20th day of November 1973.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. RENE o. TEG'IMEYER Attesting Offdncer Acting Commissioner of Patent FORM Po-1oso 1o e9) USCOMM-DC 603 76- P6Q 11.5 GOVERNMENT PRINTQNG OFFICE: i9! 0-366-33}, 

1. In a dewatering press of a paper making machine, a roll comprising a roll body, a coating covering said roll body and consisting of at least one assembly of helically wound strips, each of said strips having an inner portion engaging inner portions of adjacent strips and an outer portion narrower than the inner portion and spaced from outer portions of adjacent strips, whereby a helical groove is formed upon the outer surface of said coating, the inner portion of each of said strips having an intermediate rib fitting into a corresponding recess formed in the inner portion of an adjacent strip.
 1. In a dewatering press of a paper making machine, a roll comprising a roll body, a coating covering said roll body and consisting of at least one assembly of helically wound strips, each of said strips having an inner portion engaging inner portions of adjacent strips and an outer portion narrower than the inner portion and spaced from outer portions of adjacent strips, whereby a helical groove is formed upon the outer surface of said coating, the inner portion of each of said strips having an intermediate rib fitting into a corresponding recess formed in the inner portion of an adjacent strip. 